Russian start-up Apis Cor used innovative technology to 3D print a concrete house in 24 hours. Its large-scale radial printer produced the 38 m2 structure directly on site, eliminating the need to transport prefab elements from a factory. The printer arm can cover a circular area of 132 meters across. Just two technicians were present to watch over the process. The roof, insulation, window and door installation, and finish operations were completed after printing. Total construction cost for the curved-wall structure was just over $10,000, about $275 per square meter. A more traditional square building would cost less per unit area. Other companies are exploring similar construction techniques. For example, France’s XtreeE has 3D printed a small concrete shelter. But Apis Cor claims its house is the only one to be built on-site.